If the hydraulic fluid leaks are not too bad, you can leave seals alone. To replace seals, you have to remove drum and drain hydraulic fluid. Round rubber seal is located behind drum. After you decide what you want to do with the shoes, (replace or extend life by turning anchor pin), make sure to sand drum. This can be done by hand sanding without removing drum. If you want to remove drum, sometimes, the large nut that secures drum, can be very stubborn. Also, sometimes, drum is difficult to remove from spline after nut is removed. Do final clean-up on drums with brake cleaner. That will remove all oily residue. Drums do not have to be perfectly smooth like on a car. Remember, brakes are hardly used, and when used, speed in relatively very slow. Good luck.